[164] | 1 | /*
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| 2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without modification,
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| 6 | * are permitted provided that the following conditions are met:
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| 7 | *
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| 8 | * 1. Redistributions of source code must retain the above copyright notice,
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| 9 | * this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 11 | * this list of conditions and the following disclaimer in the documentation
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| 12 | * and/or other materials provided with the distribution.
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| 13 | * 3. The name of the author may not be used to endorse or promote products
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| 14 | * derived from this software without specific prior written permission.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 25 | * OF SUCH DAMAGE.
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| 26 | *
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| 27 | * This file is part of the lwIP TCP/IP stack.
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| 28 | *
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| 29 | * Author: Adam Dunkels <adam@sics.se>
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| 30 | *
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| 31 | */
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| 32 | #ifndef __LWIP_IP_H__
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| 33 | #define __LWIP_IP_H__
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| 34 |
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| 35 | #include "lwip/opt.h"
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| 36 |
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| 37 | #include "lwip/def.h"
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| 38 | #include "lwip/pbuf.h"
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| 39 | #include "lwip/ip_addr.h"
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| 40 | #include "lwip/err.h"
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| 41 | #include "lwip/netif.h"
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| 42 |
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| 43 | #ifdef __cplusplus
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| 44 | extern "C" {
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| 45 | #endif
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| 46 |
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| 47 | /** Currently, the function ip_output_if_opt() is only used with IGMP */
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| 48 | #define IP_OPTIONS_SEND LWIP_IGMP
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| 49 |
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| 50 | #define IP_HLEN 20
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| 51 |
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| 52 | #define IP_PROTO_ICMP 1
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| 53 | #define IP_PROTO_IGMP 2
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| 54 | #define IP_PROTO_UDP 17
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| 55 | #define IP_PROTO_UDPLITE 136
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| 56 | #define IP_PROTO_TCP 6
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| 57 |
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| 58 | /* This is passed as the destination address to ip_output_if (not
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| 59 | to ip_output), meaning that an IP header already is constructed
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| 60 | in the pbuf. This is used when TCP retransmits. */
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| 61 | #ifdef IP_HDRINCL
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| 62 | #undef IP_HDRINCL
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| 63 | #endif /* IP_HDRINCL */
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| 64 | #define IP_HDRINCL NULL
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| 65 |
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| 66 | #if LWIP_NETIF_HWADDRHINT
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| 67 | #define IP_PCB_ADDRHINT ;u8_t addr_hint
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| 68 | #else
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| 69 | #define IP_PCB_ADDRHINT
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| 70 | #endif /* LWIP_NETIF_HWADDRHINT */
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| 71 |
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| 72 | /* This is the common part of all PCB types. It needs to be at the
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| 73 | beginning of a PCB type definition. It is located here so that
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| 74 | changes to this common part are made in one location instead of
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| 75 | having to change all PCB structs. */
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| 76 | #define IP_PCB \
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| 77 | /* ip addresses in network byte order */ \
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| 78 | ip_addr_t local_ip; \
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| 79 | ip_addr_t remote_ip; \
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| 80 | /* Socket options */ \
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| 81 | u8_t so_options; \
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| 82 | /* Type Of Service */ \
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| 83 | u8_t tos; \
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| 84 | /* Time To Live */ \
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| 85 | u8_t ttl \
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| 86 | /* link layer address resolution hint */ \
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| 87 | IP_PCB_ADDRHINT
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| 88 |
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| 89 | struct ip_pcb {
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| 90 | /* Common members of all PCB types */
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| 91 | IP_PCB;
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| 92 | };
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| 93 |
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| 94 | /*
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| 95 | * Option flags per-socket. These are the same like SO_XXX.
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| 96 | */
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| 97 | /*#define SOF_DEBUG 0x01U Unimplemented: turn on debugging info recording */
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| 98 | #define SOF_ACCEPTCONN 0x02U /* socket has had listen() */
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| 99 | #define SOF_REUSEADDR 0x04U /* allow local address reuse */
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| 100 | #define SOF_KEEPALIVE 0x08U /* keep connections alive */
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| 101 | /*#define SOF_DONTROUTE 0x10U Unimplemented: just use interface addresses */
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| 102 | #define SOF_BROADCAST 0x20U /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
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| 103 | /*#define SOF_USELOOPBACK 0x40U Unimplemented: bypass hardware when possible */
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| 104 | #define SOF_LINGER 0x80U /* linger on close if data present */
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| 105 | /*#define SOF_OOBINLINE 0x0100U Unimplemented: leave received OOB data in line */
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| 106 | /*#define SOF_REUSEPORT 0x0200U Unimplemented: allow local address & port reuse */
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| 107 |
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| 108 | /* These flags are inherited (e.g. from a listen-pcb to a connection-pcb): */
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| 109 | #define SOF_INHERITED (SOF_REUSEADDR|SOF_KEEPALIVE|SOF_LINGER/*|SOF_DEBUG|SOF_DONTROUTE|SOF_OOBINLINE*/)
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| 110 |
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| 111 |
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| 112 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 113 | # include "arch/bpstruct.h"
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| 114 | #endif
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| 115 | PACK_STRUCT_BEGIN
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| 116 | struct ip_hdr {
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| 117 | /* version / header length */
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| 118 | PACK_STRUCT_FIELD(u8_t _v_hl);
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| 119 | /* type of service */
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| 120 | PACK_STRUCT_FIELD(u8_t _tos);
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| 121 | /* total length */
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| 122 | PACK_STRUCT_FIELD(u16_t _len);
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| 123 | /* identification */
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| 124 | PACK_STRUCT_FIELD(u16_t _id);
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| 125 | /* fragment offset field */
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| 126 | PACK_STRUCT_FIELD(u16_t _offset);
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| 127 | #define IP_RF 0x8000U /* reserved fragment flag */
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| 128 | #define IP_DF 0x4000U /* dont fragment flag */
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| 129 | #define IP_MF 0x2000U /* more fragments flag */
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| 130 | #define IP_OFFMASK 0x1fffU /* mask for fragmenting bits */
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| 131 | /* time to live */
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| 132 | PACK_STRUCT_FIELD(u8_t _ttl);
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| 133 | /* protocol*/
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| 134 | PACK_STRUCT_FIELD(u8_t _proto);
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| 135 | /* checksum */
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| 136 | PACK_STRUCT_FIELD(u16_t _chksum);
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| 137 | /* source and destination IP addresses */
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| 138 | PACK_STRUCT_FIELD(ip_addr_p_t src);
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| 139 | PACK_STRUCT_FIELD(ip_addr_p_t dest);
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| 140 | } PACK_STRUCT_STRUCT;
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| 141 | PACK_STRUCT_END
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| 142 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 143 | # include "arch/epstruct.h"
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| 144 | #endif
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| 145 |
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| 146 | #define IPH_V(hdr) ((hdr)->_v_hl >> 4)
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| 147 | #define IPH_HL(hdr) ((hdr)->_v_hl & 0x0f)
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| 148 | #define IPH_TOS(hdr) ((hdr)->_tos)
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| 149 | #define IPH_LEN(hdr) ((hdr)->_len)
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| 150 | #define IPH_ID(hdr) ((hdr)->_id)
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| 151 | #define IPH_OFFSET(hdr) ((hdr)->_offset)
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| 152 | #define IPH_TTL(hdr) ((hdr)->_ttl)
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| 153 | #define IPH_PROTO(hdr) ((hdr)->_proto)
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| 154 | #define IPH_CHKSUM(hdr) ((hdr)->_chksum)
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| 155 |
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| 156 | #define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = (((v) << 4) | (hl))
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| 157 | #define IPH_TOS_SET(hdr, tos) (hdr)->_tos = (tos)
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| 158 | #define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
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| 159 | #define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
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| 160 | #define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
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| 161 | #define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
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| 162 | #define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
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| 163 | #define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
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| 164 |
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| 165 | /** The interface that provided the packet for the current callback invocation. */
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| 166 | extern struct netif *current_netif;
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| 167 | /** Header of the input packet currently being processed. */
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| 168 | extern const struct ip_hdr *current_header;
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| 169 | /** Source IP address of current_header */
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| 170 | extern ip_addr_t current_iphdr_src;
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| 171 | /** Destination IP address of current_header */
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| 172 | extern ip_addr_t current_iphdr_dest;
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| 173 |
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| 174 | #define ip_init() /* Compatibility define, not init needed. */
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| 175 | struct netif *ip_route(ip_addr_t *dest);
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| 176 | err_t ip_input(struct pbuf *p, struct netif *inp);
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| 177 | err_t ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
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| 178 | u8_t ttl, u8_t tos, u8_t proto);
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| 179 | err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
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| 180 | u8_t ttl, u8_t tos, u8_t proto,
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| 181 | struct netif *netif);
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| 182 | #if LWIP_NETIF_HWADDRHINT
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| 183 | err_t ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
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| 184 | u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint);
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| 185 | #endif /* LWIP_NETIF_HWADDRHINT */
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| 186 | #if IP_OPTIONS_SEND
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| 187 | err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
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| 188 | u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
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| 189 | u16_t optlen);
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| 190 | #endif /* IP_OPTIONS_SEND */
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| 191 | /** Get the interface that received the current packet.
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| 192 | * This function must only be called from a receive callback (udp_recv,
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| 193 | * raw_recv, tcp_accept). It will return NULL otherwise. */
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| 194 | #define ip_current_netif() (current_netif)
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| 195 | /** Get the IP header of the current packet.
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| 196 | * This function must only be called from a receive callback (udp_recv,
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| 197 | * raw_recv, tcp_accept). It will return NULL otherwise. */
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| 198 | #define ip_current_header() (current_header)
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| 199 | /** Source IP address of current_header */
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| 200 | #define ip_current_src_addr() (¤t_iphdr_src)
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| 201 | /** Destination IP address of current_header */
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| 202 | #define ip_current_dest_addr() (¤t_iphdr_dest)
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| 203 |
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| 204 | /** Gets an IP pcb option (SOF_* flags) */
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| 205 | #define ip_get_option(pcb, opt) ((pcb)->so_options & (opt))
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| 206 | /** Sets an IP pcb option (SOF_* flags) */
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| 207 | #define ip_set_option(pcb, opt) ((pcb)->so_options |= (opt))
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| 208 | /** Resets an IP pcb option (SOF_* flags) */
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| 209 | #define ip_reset_option(pcb, opt) ((pcb)->so_options &= ~(opt))
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| 210 |
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| 211 | #if IP_DEBUG
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| 212 | void ip_debug_print(struct pbuf *p);
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| 213 | #else
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| 214 | #define ip_debug_print(p)
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| 215 | #endif /* IP_DEBUG */
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| 216 |
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| 217 | #ifdef __cplusplus
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| 218 | }
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| 219 | #endif
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| 220 |
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| 221 | #endif /* __LWIP_IP_H__ */
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| 222 |
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| 223 |
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